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Process and system for treating waste water
| Details |
Inventors: Olesen, Douglas E.; Shuckrow, Alan J.;
Assignee: Battelle Pacific N. W. Laboratories (Richland, WA)
Primary Examiner: Wyse; Thomas G.
Assistant Examiner:
Attorney, Agent or Firm: Seed, Berry, Vernon & Baynham
A process of treating raw or primary waste water using a powdered, activated carbon/aerated biological treatment system is disclosed. Effluent turbidities less than 2 JTU (Jackson turbidity units), zero TOC (total organic carbon) and in the range of 10 mg/l COD (chemical oxygen demand) can be obtained. An influent stream of raw or primary waste water is contacted with an acidified, powdered, activated carbon/alum mixture. Lime is then added to the slurry to raise the pH to about 7.0. A polyelectrolyte flocculant is added to the slurry followed by a flocculation period -- then sedimentation and filtration. The separated solids (sludge) are aerated in a stabilization sludge basin and a portion thereof recycled to an aerated contact basin for mixing with the influent waste water stream prior to or after contact of the influent stream with the powdered, activated carbon/alum mixture. |
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DETAILED DESCRIPTION It is a primary object of this invention to provide an improved process and system for the treatment of raw or primary waste water using a combination powdered, activated carbon/aerated biological treatment process.
Another object of this invention is to provide a process and system for removal of what is generally designated a "nonsorbable fraction of organic material" from raw or primary waste water.
Although a limited amount of work has been carried out on the addition of powdered, activated carbon to conventional activated sludge systems, no work, to Applicant's knowledge has focused on combined, short detention time, powdered, activated carbon/aerated biological treatment systems.
The process comprises (1) contacting the influent waste water stream with a slurry containing powdered, activated carbon for adsorption of the organic material thereon, (2) effecting solid-liquid separation, (3) discharging an oxygen-containing gas stream through the separated solids, and (4) recycling a portion of the aerated solids to an aerated contact basin through which the influent waste water stream is also directed.
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